[CentOS] CENTOS 5.3 "kernel segfault at ..."

We have CENTOS 5.3 on DELL server.  Recently I saw /var/log/messages have following pop-up:


Dec 19 11:31:45 ORA2 kernel: oracle[18900]: segfault at fffffffffffffff0 rip 0000000007d54183 rsp 00007fff8eff2c60 error 4
Dec 19 11:31:49 ORA2 kernel: oracle[18902]: segfault at fffffffffffffff0 rip 0000000007d54183 rsp 00007ffff5e12a80 error 4
Dec 19 11:31:53 ORA2 kernel: oracle[18904]: segfault at fffffffffffffff0 rip 0000000007d54183 rsp 00007fff228684d0 error 4


Anyone know why?

Thanks.

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